RFR: [8u] Critical backports to sh/jdk8u

[Zhengyu Gu]

Backport looks good.

-Zhengyu

On 01/26/2018 11:48 AM, Aleksey Shipilev wrote:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk8u-20180126-crit/webrev.01/
> 
> We do not have much time to complete bulk backports, so let us backport only the critical
> bug/perf/test fixes:
> 
> dc779781dd5e: Do not put down update-refs-in-progress flag concurrently
> 1d1238a0603b: Defer cleaning of system dictionary and friends to parallel cleaning phase
> 1a6a9f288dd2: Bitmap size might not be page aligned when large page is used
> 30e8ba6e2794: VerifyJCStressTest should test all heuristics
> 820129a799b1: Allocation failure injection machinery
> 
> Let's do these right now. We shall backport other things as time allows.
> 
> Testing: hotspot_gc_shenandoah {fastdebug|release}
> 
> Thanks,
> -Aleksey
>